Villager trade menu missing name

Confirmed in 13w02b.

This is probably due to renameable mobs. SethBling's video on the update showed that renamed Villagers showed this name in their trade area. It can be assumed, since they normally don't have a name, the area is never filled. Weird that got past them.

Still happens on 13w05b

Renamed villagers show the new name, whereas unrenamed villagers show nothing.